Normally an s but not the apostrophe.
The plural of the word piano is pianos. Most nouns have an S added to them to make them plural.
By adding an apostrophe to the end of the word.If the word does not end with an 's' then add an apostrophe and then 's'.For example:The girls' room. (word ends in an 's' so just an apostrophe is added)The men's room. (word does not end in an 's' so an apostrophe then 's' is added)
The word "princes" (and a few others where an -ess form is possible). Prince becomes plural when an S is added but becomes a singular noun (the female gender) by adding another S.
A suffix is an ending added to a word, like -ing added to ask in the word asking.A plural suffix is a suffix that turns a word into a plural (more than one). In English, the most common plural suffix is -s, as in cats, where the -s turns a singular cat into more than one.Another common plural suffix is -es, as in potatobecoming potatoes.
An 's' can be added with an apostrophe as a contraction for the word "is".For example: The equipment's in the cupboard. (The equipment is in the cupboard)An 's' should not be added to form the plural. Equipment is an uncountable noun.
The plural noun is oboes - but you have only added an S to oboe, which does not end with an O.All musical terms that end in O are made plural by adding an S. (solo, solos)
A plural noun ending with an s is possessive if it has an apostrophe after the s (s'), for example, horses-horses' or parents-parents'.A plural noun that does not end with an s has an apostrophe s ('s) added to the end of the word, for example, children-children's or teeth-teeth's.
If the word is already plural, such as children, add an apostrophe and then the s, such as "the children's books". This is also the case with plurals which are formed when an s is added, e.g. the dogs' kennels. If the word is not already a plural, the apostrophe goes before the s, e.g. the dog's kennel.
my - mi(s) your (singular, informal) - tu(s) your (singular+plural, formal)/his/her/their - su(s) our - nuestro(s)/nuestra(s) (male/female to match what is possessed) your (informal, plural) - vuestro(s)/vuestra(s) (male/female as above) The (s) is added if what is possessed is in the plural
plural.
I hope you mean "stylo"; if you do, it's short for stylograph, the plural form of which is stylographs. I assume that the plural form for the shortened form would also be no more than an added S to the word.
The word is "I" which becomes "is".